Ceramics-Silikáty 51 (2) 98-101 (2007)

RHEOMETRY OF CONCENTRATED CERAMIC SUSPENSIONS - STEPS FROM MEASURED TO RELEVANT DATA

PART 2. ROTATIONAL VISCOMETER WITH COAXIAL CYLINDERS - BINGHAM MODEL

J. Andertová, J. Moravec, F. Rieger, K. Švarcová

The knowledge of flow behavior of ceramic suspensions is an important condition for control of ceramic wet processing. The flow behavior can be stated by the rheological measurements. The aim of the measurements was to obtain the flow curve and to propose suitable and simple rheological model for the flow behavior description. The Bingham model is the simplest model used for description of rheological behavior of plastic ceramic materials. Using this model, the relation of shear stress t and shear rate g can be expressed by the following relation: t = _p + ₀ for t  ₀ where ₀ is the yield stress and mp stands for plastic viscosity. The several arrangements of rotational viscometer method with coaxial cylinders were used in rheological measurements. The procedure of experimental data evaluation from rotational viscometer with coaxial cylinders to obtain parameters ₀ and mp is presented.

Keywords: Rheology, Ceramics, Suspension, Clay, Rotational viscometry, Bingham model.